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You can read the serial number of the batteries when you plug in the P2V+ to your assistant software and look at the main screen, I think it's the status screen.

All my batteries that are SN 964, 2455 & 10968 have the small gold pads. I just got the P2V+ and the spare battery that came with it had the square pads. I have yet to write down the serial numbers on my new ones.